风化半圆形河谷引起的土层与地形放大效应

张宁; 高玉峰; 代登辉; 陈欣

doi:10.13409/j.cnki.jdpme.2017.01.001

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风化半圆形河谷引起的土层与地形放大效应

地震工程 | 更新时间：2025-12-11

- 风化半圆形河谷引起的土层与地形放大效应
- Soil and Topographic Amplification Effects by a Weathered Semi-circular Canyon
- 防灾减灾工程学报 2017年37卷第1期页码：1-8
- 作者机构：
- 作者简介：
- 基金信息：
  
  国家自然科学基金项目（51479050,51608172,41630638）;国家重点基础研究发展计划（973计划）项目（2015CB057901）;水利部公益性行业科研专项项目（201501035-03）;中央高校基本科研业务费项目（2015B01214）资助
- DOI：10.13409/j.cnki.jdpme.2017.01.001
  中图分类号： U435
- 纸质出版：2017
- 稿件说明：
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[1]张宁,高玉峰,代登辉,陈欣.风化半圆形河谷引起的土层与地形放大效应[J].防灾减灾工程学报,2017,37(01):1-8.

张宁, 高玉峰, 代登辉, et al. Soil and Topographic Amplification Effects by a Weathered Semi-circular Canyon[J]. 2017, 37(1): 1-8.
[1]张宁,高玉峰,代登辉,陈欣.风化半圆形河谷引起的土层与地形放大效应[J].防灾减灾工程学报,2017,37(01):1-8. DOI： 10.13409/j.cnki.jdpme.2017.01.001.

张宁, 高玉峰, 代登辉, et al. Soil and Topographic Amplification Effects by a Weathered Semi-circular Canyon[J]. 2017, 37(1): 1-8. DOI： 10.13409/j.cnki.jdpme.2017.01.001.

摘要

为从理论上揭示二维土层放大效应、地形效应及其相对重要性

构造了含有风化层的半圆形河谷的数学物理模型

利用波函数展开法在弹性动力学的理论框架内提出了风化半圆形河谷对平面SH波散射和衍射的解析级数解。计算并对比了风化与未风化河谷的地表位移反应

通过系统分析地面运动的放大形态与幅值

发现二维土层放大效应通常在风化土层范围内占据绝对优势

而地形效应控制着风化土层范围以外的地面运动放大

并且土层放大值通常大于地形放大值。

Abstract

To investigate theoretically the 2Dsoil amplification

topographic amplification and their relative significance

an exact solution to the scattering and diffraction of plane SH waves induced by a weathered semi-circular canyon is proposed by the wavefunction expansion method within the framework of elastodynamics.The ground motions for both of the weathered and unweathered canyons are calculated and compared to reveal the roles of 2Dsoil and topographic effects.It is found that the 2Dsoil effects usually dominate the amplification pattern of surface ground motions within the weathered canyon

while the topographic effects control the amplification of ground motions outside the inhomegeneity.The 2Dsoil amplification generally outweighs the topographic amplification.

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references

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